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S > SINCLAIR  > MK 14   

MK 14

The MK-14 was the first computer made by the Sinclair company (at the time called Science of Cambridge because the Sinclair name was used by another company).

The MK-14 was a training board sold in kit form for £39.95 and featuring a National Semiconductor SC/MP 8-bit processor, 256 bytes of RAM, 512 bytes of ROM holding a monitor, calculator keyboard and display, and some I/O ports.

In fact, Clive Sinclair was not very enthusiastic about a personal computer project. The MK-14 project was thus managed by Chris Curry and produced by National Semiconductor. As the system was five times cheaper than its closest competitor, the Compukit UK-101, about 20,000 MK-14 boards were sold in the U.K.

Chris Curry, who believed much more than Clive Sinclair in the future of such computers, left the company in 1978, founded Acorn Computers with Herman Hauser and built its fist computer kit, the System 1. A few months later, Clive Sinclair decided that computers were a good way to raise money and started a new project: a complete computer for less than £100.

Meantime, the MK-14 grew into a modular system and several additional cards allowed expansion of the system: cassette interface, text and graphics video module and Eprom programmer. 128 and 256 bytes RAM expansion chips could also be added up to a total of 640 bytes. Yes...640 BYTES...

The version pictured here is an issue 4 with a better mechanical keyboard than the 'sensitive' one of the earlier versions, as well as optional RAM and I/O chips. At least 5 issues were sold. The issue 5 featured additional I/O ports.

If the MK-14 had not been launched, Clive Sinclair probably wouldn't have thought of his ZX-80 so soon, and the global personal computer scene would have been very different.


David Rayner adds:
The Keyboard was unreliable I bought a separate keyboard. There was no storage so every program had to typed in machine code every time. (I never had the tape interface).
The first test program was jmp 0000 (3 bytes). There was a shoot the duck game (a character flying acroos the calculator style display). By connecting a speaker you play "music". It was actually quite fun.

Mark Dodd reports to us:
We used these things with a ROM burner in an Australian college for our Microprocessor training.
The smarter ones in the classes wrote programs that rewrote themselves as they went.

Please consider donating your old computer / videogame system to or one of our partners from anywhere in the world (Europe, America, Asia, etc.).


I always wanted one of these when I started looking at Practical Wireless, aged twelve or so...even one hundred pounds was too much - a LOT of money nack then, I got fifty pence per week pocket money, lol.

Now I''m all Grown Up and Professional, I think it''s time I got one of these - great toy, plus good tool for Education too.

I have quite a few legacy bits and piieces...SUN SPACstation 2, VT220, 500MB dead heavy hard drive...primitive,, but so much better build qulaity than today. I''m hoping to make someswaps here, and finally get my own Mk 14.

Wednesday 14th May 2014
Michael Butler (England)
Various technical hobbies...

I used to have an MK14. Last summer I put a tool chain together using Paul Robson''s simulator and an assembler.

Assemble MK14 code and start the simulator with the code loaded.

Wednesday 6th March 2013
doug rice (UK)
MK14 tool chain

The first computer I bought$ I''d just started work and couldn''t run to a Nascom... like all things Sinclair I believe I had to resort to legal threats to get the thing delivered. But I learned an awful lot from that thing - including designing a video card from scratch, after a lot of false starts, and a tape interface.

One odd memory was standing in Technomatic in London (Edgware Road?) for a couple of memory chips for it when a chap slammed the door of the shop open, rode in on a unicycle, spun around a couple times, yelled ''B***** me!'' and rode out again...

The MK14 is still on my desk at work.

Friday 13rd July 2012
Neil Barnes (UK)
Nailed Barnacle


TYPE  Home Computer
ORIGIN  United Kingdom
YEAR  1978
KEYBOARD  Sensitive and later mechanical hexadecimal 21key
CPU  National Semiconductor SC/MP II
SPEED  4.4 MHz
CO-PROCESSOR  Optional 8154 I/O RAM chip (not really a coprocessor..)
RAM  128 Bytes expandable to 640 bytes on board (not Kbytes!)
VRAM  No video as standard
ROM  512 bytes, holds the monitor
TEXT MODES  1 line of 8 or 9 digits
SIZE / WEIGHT  11.5 (W) x 25.5 (H) cm
I/O PORTS  I/O lines, external keyboard
POWER SUPPLY  External AC transformer. Built in 5v cc regulator
PERIPHERALS  RAM and ROM cards, tape recorder card, video,...
PRICE  £39.99

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